When I'm trying to install Siebel Web Client on Windows 7 (x64) I get the error message:
OUI-10133: Invalid staging area. There are no top level components for Windows NT, Windows 2000 available for installation in this staging area.

I've checked if there is products.xml file and FROM_LOCATION variable and it seems okay.
The error is showed when installer is trying to update lan.rsp file.
There is "The installation of Siebel Web Client was successful." string at the end of installActions2013-04-05_02-20-18PM.log file.

I tried to install Web Client by using the manual described at "Oracle Siebel CRM Developers Handbook".

it might not help you, but I've seen this error a lot without any specific reason.

I built an installation package which installs fine on 8 out of 10 machines, but the other 2 experience your error message. Sometimes after uninstalling and re-installing a few times manually, it just works. Yes, sometimes it also helps to give admin rights to the user.

The problem is with the Windows_Image_Creator.exe. I had the same issue and I was able to fix it.

- I had a Windows 7 machine (32 bit and 64 bit , both run to the same issue), and tried to install Siebel 8.1.1.0 Developer Web Client (before applying the fix pack 8.1.1.10).

- The installer was throwing the following error "OUI-10133: Invalid staging area. There are no top level components for Windows NT, Windows 2000 available for installation in this staging area. " just before the installation is finished.

- Here are the steps I have done to fix the problem:

1- Go to "C:\Siebel_Install_Image\8.1.1.0\Windows\Client\Siebel_Web_Client\Disk1\stage\langs\en " and check if you have 2 folders (Disk1, Translations). If you do NOT find the folder named "Disk1" then continue with this solution otherwise this solution does not apply to you.

2- The problem is that the Windows_Image_Creator.exe did not create the folder called "Disk1" in the previous path mentioned in step1. So we have to fix this by running the windows image creator again to create the client image correctly.

3- Before running the windows image creator, go to where the JAR files are, in my case: "C:\Siebel_Install_Image\JAR_8.1.1.0" and look for the two following JAR files:

- SBA_8.1.1.0_Base_Windows_Siebel_Web_Client

- SBA_8.1.1.0_enu_Windows_Siebel_Web_Client

The problem was here: the Windows_Image_Creator.exe picked only the Base JAR file to create the client install image and for some reasons it did not include the second JAR file which is the language file enu.

4- So my way to get through this was:

a- Moved the BaseJAR file SBA_8.1.1.0_Base_Windows_Siebel_Web_Client away to a different location (ex: to Desktop)

c- Run the Windows_Image_Creator.exe. again to create (fix) the Siebel Web Client install image (DO NOT delete the client image that was created before, this step will only fix the existing image by adding the missing folder Disk1)

d- After the the installer is finished, go back to "C:\Siebel_Install_Image\8.1.1.0\Windows\Client\Siebel_Web_Client\Disk1\stage\langs\en" and make sure that now you see two folders (Disk1, Translations)

5- Try to install the Client again, and hopefully this time will work.